I've reverted the change to overrides.css that this patch made as it was that that was causing the padding issue on backgrid that we noted this morning when looking at the debugger.
We have added Select2Cell Editor for backgrid, eariler as it was not present & causing issue in rendering in subnode control.
Looks good to me, but - have some feedback.
1. Can you please mention - why do we need 'openOnEnter: false' in select2 options?
2. There is a difference between UI, when rendered from the editor, and from the Select2Cell. (I can see padding, when the Cell is rendered, but - not when editor is rendered.)